@bookEbert_Engels_1994, title=Observable or Invocable Behaviour - You Have to Choose, publisher=Vakgroep Informatica, Rijksuniversiteit Leiden, author=Ebert, Jürgen and Engels, Gregor, year=1994 
LibreCat: /record/8193

@inproceedingsAndries_Engels_1994, place=Berlin/Heidelberg, series=LNCS, title=Syntax and Semantics of Hybrid Database Languages, volume=776, DOI=http://dx.doi.org/10.1007/3-540-57787-4_2, booktitle=Proceedings of the International Workshop on Graph Transformations in Computer Science (1993), Dagstuhl (Germany), publisher=Springer, author=Andries, Marc and Engels, Gregor, year=1994, pages=19–36, collection=LNCS 
LibreCat: /record/8263
DOI: http://dx.doi.org/10.1007/3-540-57787-4_2

@inproceedingsEngels_Groenewegen_1994, place=Berlin/Heidelberg, series=LNCS, title=Specification of coordinated behaviour by SOCCA, DOI=http://dx.doi.org/10.1007/3-540-57739-4_19, booktitle=Proceedings of the Third European Workshop on Software Process Technology (EWSPT 1994), Villard de Lans (France), publisher=Springer, author=Engels, Gregor and Groenewegen, Luuk, year=1994, pages=128–151, collection=LNCS 
LibreCat: /record/8264
DOI: http://dx.doi.org/10.1007/3-540-57739-4_19

@inproceedingsEngels_Löhr_1994, place=Berlin/Heidelberg, title=Visual Specification of Complex Database Actions, booktitle=Proceedings of the 2nd International East/West Database Workshop, Klagenfurt (Germany), publisher=Springer, author=Engels, Gregor and Löhr, Perdita, year=1994, pages=303–314 
LibreCat: /record/8265

@articleLöhr-Richter_Engels_1994, title=Visuelles Spezifizieren von komplexen Aktionen auf Datenbankstrukturen, volume=13, journal=GI-Datenbank Rundbrief, author=Löhr-Richter, Perdita and Engels, Gregor, year=1994, pages=33–35 
LibreCat: /record/7407

@inbookEbert_Engels_1994, title=Design Representation, booktitle=Encyclopedia of Software Engineering, publisher=John Wiley &; Sons, Inc., author=Ebert, Jürgen and Engels, Gregor, year=1994, pages=382–394 
LibreCat: /record/7512

@inbookEngels_Groenewegen_1994, place=Taunton, title=SOCCA: Specifications of Coordinated and Cooperative Activities, booktitle=Software Process Modelling and Technology, publisher=Research Studies Press, author=Engels, Gregor and Groenewegen, Luuk, year=1994, pages=71–102 
LibreCat: /record/7513

@inproceedingsEngels_Verrijn-Stuart_1993, series=Reihe 10: Informatik/Kommunikationstechnik, title=Integrationsaspekte bei verteilter Software-Entwicklung, number=251, booktitle=Fortschritt-Berichte VDI, publisher=VDI Verlag, author=Engels, Gregor and Verrijn-Stuart, A.A., year=1993, pages=45–53, collection=Reihe 10: Informatik/Kommunikationstechnik 
LibreCat: /record/7826

@bookAndries_Engels_1993, title=A Hybrid Query Language for the Extended Entity Relationship Model, publisher=Vakgroep Informatica, Rijksuniversiteit Leiden, author=Andries, Marc and Engels, Gregor, year=1993 
LibreCat: /record/8190

@bookEhrig_Engels_1993, title=Towards a Module Concept for Graph Transformation Systems, publisher=Vakgroep Informatica, Rijksuniversiteit Leiden, author=Ehrig, Hartmut and Engels, Gregor, year=1993 
LibreCat: /record/8191

@bookEngels_Rozenberg_1993, title=Abstracts COMPUGRAPH II Workshop, publisher=Vakgroep Informatica, Rijksuniversiteit Leiden, author=Engels, Gregor and Rozenberg, Grzegorz, year=1993 
LibreCat: /record/8192

@inproceedingsEngels_Groenewegen_1993, place=Washington, DC, USA, title=Modular, Visual Specifications of Software Processes, booktitle=Proceedings of the Workshop on Software Process (ISPW 1993), Wadern (Germany), publisher=IEEE Computer Society, author=Engels, Gregor and Groenewegen, Luuk, year=1993, pages=66–68 
LibreCat: /record/8262

@inproceedingsKoopman_Groenewegen_Engels_1992, title=Functional Description of Parallel Processes, booktitle=Proceedings of the conference SION Computing Science in the Netherlands (CSN ’92), The Netherlands, author=Koopman, Pieter and Groenewegen, Luuk and Engels, Gregor, year=1992, pages=156–167 
LibreCat: /record/7825

@bookEngels_1992, title=Visual Specifications of Conceptual Database Schemata (Abstract), publisher=Leiden University, author=Engels, Gregor, year=1992 
LibreCat: /record/8189

@inproceedingsEngels_Löhr-Richter_1992, place=Washington, DC, USA, title=CADDY: A Highly Integrated Environment to Support Conceptual Database Design, booktitle=Proceedings of the Fifth International Workshop on Computer-Aided Software Engineering (CASE 1992), Montreal (Canada), publisher=IEEE Computer Society, author=Engels, Gregor and Löhr-Richter, Perdita, year=1992, pages=19–22 
LibreCat: /record/8260

@inproceedingsEngels_Groenewegen_1992, place=Berlin/Heidelberg, series=LNCS, title=Specification of Coordinated Behaviour in the Software Development Process, volume=635, DOI=http://dx.doi.org/10.1007/BFb0017495, booktitle=Proceedings of the Second European Workshop on Software Process Technology (EWSPT 92), Trondheim, Norway, publisher=Springer, author=Engels, Gregor and Groenewegen, Luuk, year=1992, pages=58–60, collection=LNCS 
LibreCat: /record/8261
DOI: http://dx.doi.org/10.1007/BFb0017495

@articleHohenstein_Engels_1992, title=SQL/EER - Syntax and Semantics of an Entity-Relationship-Based Query Language, volume=17, DOI=http://dx.doi.org/10.1016/0306-4379(92)90014-E, number=3, journal=Information Systems, author=Hohenstein, Uwe and Engels, Gregor, year=1992, pages=209–242 
LibreCat: /record/7408
DOI: http://dx.doi.org/10.1016/0306-4379(92)90014-E

@articleEngels_Lewerentz_Nagl_Schäfer_Schürr_1992, title=Building Integrated Software Development Environments, Part I: Tool Specification, volume=1, number=2, journal=ACM Transactions on Software Engineering and Methodology (TOSEM), author=Engels, Gregor and Lewerentz, Claus and Nagl, Manfred and Schäfer, Wilhelm and Schürr, Andy, year=1992, pages=135–167 
LibreCat: /record/7409

@articleEngels_Gogolla_Hohenstein_Hülsmann_Löhr-Richter_Saake_Ehrich_1992, title=Conceptual Modelling of Database Applications Using an Extended ER Model, volume=9, DOI=http://dx.doi.org/10.1016/0169-023X(92)90008-Y, number=2, journal=Data &; Knowledge Engineering, author=Engels, Gregor and Gogolla, Martin and Hohenstein, Uwe and Hülsmann, Klaus and Löhr-Richter, Perdita and Saake, Gunter and Ehrich, Hans-Dietrich, year=1992, pages=157–204 
LibreCat: /record/7410
DOI: http://dx.doi.org/10.1016/0169-023X(92)90008-Y

@bookLöhr-Richter_Engels_1991, place=Leiden University, P.O. Box 9500, 2300 RA Leiden, The Netherlands, title=Incremental Design of Conceptual Database Schemata with CADDY, publisher=Leiden University, author=Löhr-Richter, Perdita and Engels, Gregor, year=1991 
LibreCat: /record/8188